i have a '92 300e w 121k.
at about 102k i had new valve guide oil stem seals put in my car.
it has made a world of difference, the [excess] oil consumption is gone.
mercedes shop brother [ha ha] "stevebfl" aka as steve brotherton owns contiental motors in gainesvill, fl. the job cost around $300.00 + $ 100.00 lodging.food,gas. it was worth it to me. i live in west virginia, but enjoyed the road trip.
where do you live?
have you checked the section "good mb shops"?
i don't know what it would cost to do yourself. i think the difficulty factor is about a 5 out of 10
some of you other guys chime in
also try a "search" on this subject.
*92 400e 124.034, SOLD
*92 300e 124.030, SOLD